Here's another list of some new publications on Southeast Asia. Click on any the book covers below for more information of the book and its availability from SOAS Library.
OAPEN (Open Access Publishing in European Networks) is a collaborative initiative to develop and implement a sustainable Open Access publication model for academic books in the Humanities and Social Sciences.
Here's an example of searching results for 'Southeast Asia' and 'Asia Pacific' found at OPEN Library (as of today 6.3.11).